Difference between revisions of "Alpine Linux:FAQ"
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= Dynamic DNS =
= Dynamic DNS =
Revision as of 12:51, 16 May 2017
This is a list of frequently asked questions about Alpine Linux.
If your question is not answered on this page, use the search box above to find work in progress pages not linked here, or in case of no answer, edit this page and write down your question.
- 1 General
- 1.1 I have found a bug, where can I report it?
- 1.2 Are there any details about the releases available?
- 1.3 Alpine freezes during boot from Compact Flash, how can I fix?
- 1.4 How can I contribute?
- 1.5 How do I remove the CDROM?
- 1.6 Why don't I have man pages or where is the 'man' command?
- 1.7 Booting Alpine on an HP ML350 G6
- 1.8 My cron jobs don't run?
- 1.9 What is the difference between edge and stable releases?
- 1.10 What kind of release of Alpine Linux are available?
- 2 Setup
- 3 Audio
- 4 Time and timezones
- 5 Packages
- 6 Dynamic DNS
- 7 Terminal
I have found a bug, where can I report it?
You can report it on the bugtracker.
Are there any details about the releases available?
Yes, please check the Releases page.
Alpine freezes during boot from Compact Flash, how can I fix?
Most Compact Flash card readers do not support proper DMA.
You should append nodma to the append line in syslinux.cfg.
How can I contribute?
You can contribute by:
- using the software and giving feedback
- by documenting your Alpine Linux experiences on this wiki
- in many other ways
Please visit Contribute page to read more about this topic.
Your contributions are highly appreciated.
How do I remove the CDROM?
Since the modloop loopback device is on CDROM you cannot just run
eject. You need to unmount the modloop first.
Unmounting both the modloop and the CDROM in one step can be done by executing:
Then it's possible to eject the CDROM:
Why don't I have man pages or where is the 'man' command?
man command and man pages are not installed by default.
- First, install the package:
- Once that's done, install the documentation for the packages that you require man pages for.
(Keep in mind, however, it's possible that not all packages will have a corresponding documentation package.)
- For example, say you installed and you now require its man pages:
In our example above, we installed the man pages (and other documentation) for
iptables. We can now read it:
Booting Alpine on an HP ML350 G6
Details: Kernel module for HP Watchdog Timer causes issues during boot. Solution is to create an overlay (ie hpwdt.apkovl.tar.gz) containing /etc/modprobe.d/hpwdt (which contains "blacklist hpwdt"), place that on some removable media (ie USB key) and insert that during boot process. This will insure that the offending module doesn't load and that the server will boot properly.
My cron jobs don't run?
The cron daemon is started automatically on system boot and executes the scripts placed in the folders under /etc/periodic - there's a 15min folder, plus ones for hourly, daily, weekly and monthly scripts.
You can check whether your scripts are likely to run using the command:
- - for example: run-parts --test /etc/periodic/15min
This command will tell you what should run but will not actually execute the scripts.
If the results of the test are not as expected, check the following:
- Make sure the script is executable - if unsure, issue the command :
- Make sure the first line of your script is :
- Do not put file extensions on your script names - this stops them from working; for example: myscript will run, but myscript.sh won't
What is the difference between edge and stable releases?
Stable releases are just what they sound like: initially a point-in-time snapshot of the package archives, but then maintained with bugfixes only in order to keep a stable environment.
Edge is more of a rolling-release, with the latest and greatest packages available in the online repositories.
Occasionally, snapshot ISO images of the then-current state of edge are made and are available for download.
Typically these are made when there are major kernel upgrades or package upgrades that require initramfs rebuilds.
What kind of release of Alpine Linux are available?
Please check the Releases page for more information.
What is the difference between 'sys', 'data', and 'diskless' installs when running setup-alpine (or setup-disk)?
sys: This mode is a traditional disk install. The following partitions will be created on the disk: /boot, / (filesystem root) and swap.
This mode may be used for development boxes, desktops, virtual servers, etc.
data: This mode uses your disk(s) for data storage, not for the operating system. Only /var is created on disk. The system itself will run from tmpfs (RAM).
Use this mode if you only want to use the disk(s) for a mailspool, databases, logs, etc.
diskless: No disks are to be used. Alpine local backup may still be used in this mode.
These modes are explained further on the Installation page.
How can I install a custom firmware in a diskless system?
The modules and firmware are both special images which are mounted as read-only.
To fix this issue you can copy the firmware directory to your writeable media (cf/usb) and copy your custom firmware to it.
After reboot Alpine should automatically use the directory on your local storage instead of the loopback device.
How do I play my .ogg/.mp3 files?
First, the sound card should be recognized (you must have /dev/snd/***** files)
, , etc all use the oss sound driver, while Alpine uses ALSA drivers.
So you need to load the snd-pcm-oss compatibility module.
While you're at it, you might need to turn up the sound volume
Time and timezones
How do I set the local timezone?
Starting in Alpine 2.2, setting the timezone can be done through the setup-alpine script, and no manual settings should be necessary.
If you wish to edit the timezone after installation, run the setup-timezone script.
However, if you are using a previous version, please use the following steps:
/etc/timezone and the whole zoneinfo directory tree are not supported. To set the timezone, set the TZ environment variable as specified in http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html or you may also create an /etc/TZ file of a single line, ending with a newline, containing the TZ setting. For example echo CST6CDT > /etc/TZ
For more information, see how other uClibc-based distributions do this:
For a more complete list of timezones, please see: http://en.wikipedia.org/wiki/List_of_tz_database_time_zones
OpenNTPD reports an error with "adjtime"
Your log contains something like:
reply from 22.214.171.124: offset 865033148.784255 delay 0.055466, next query 32s reply from 126.96.36.199: offset 865033148.779314 delay 0.400771, next query 3s adjusting local clock by 865033148.779835s adjtime failed: Invalid argument
is supposed to make small adjustments in the time without causing time jumps.
If the adjustment is too big then something is clearly wrong and ntpd gives up. (its actually adjtime(3) that has a limit on how big adjustments are allowed)
You can make ntpd set the time at startup by adding -s option to ntpd. This is done by setting NTPD_OPTS="-s" in /etc/conf.d/ntpd.
Using a cron job to keep the time in sync
Add the following to /etc/periodic/daily (or use another folder under the /etc/periodic heirarchy if you want to run the script more/less frequently)
Example: file called do-ntp
#!/bin/sh ntpd -d -q -n -p uk.pool.ntp.org
This queries the uk time server pool - you can modify this to suit your localisation, or just use pool.ntp.org. More info here: http://www.pool.ntp.org/zone/@
Windows clients reports an error when trying to sync
needs to run for a while before it is satisfied it is in sync. Until then it will set a flag "clock not synchronized" and Windows will report an error while trying to sync with your server.
Only thing to do is wait, do something else for 15-20mins and then check.
Can you build an apk package for ...?
How can I build my own package?
Please see the Creating an Alpine package page.
WARNING: Ignoring APKINDEX.xxxx.tar.gz
If you get
WARNING: Ignoring APKINDEX.xxxx.tar.gz: No such file or directory while running package related tools, check your /etc/apk/repositories file if an entry points to .../v2.4/testing/. This directory is gone.
To check the content of the repositories file
What does "required by: world[$pkgname]" mean?
It means that the package you try to install does not exist in the repositories you have configured in
/etc/apt/repositories. Maybe you forgot to add community, testing or unmaintained to /etc/apt/repositories?
How do I schedule a regular dynamic DNS update?
You'll want to install thepackage:
After that, create a new file at /etc/ez-ipupdate.conf with the contents similar to:
service-type=dyndns user=myusername:mypassword interface=eth1 host=myhostname.dyndns.org
Make the new ip cache directory:
Then schedule a new cron job with this command:
Don't forget to backup your settings!
How to enable/fix colors for git?
The problem is not in git itself or terminal, but in the less command. Busybox’s less doesn’t support -r (--raw-control-chars) and -R (--RAW-CONTROL-CHARS) options.
The simplest (yet not ideal) solution is to install GNU less: